JP6561035B2 - Automatic ventilation packaging bag - Google Patents

Description

  The present invention relates to an automatic ventilation packaging bag that automatically exhausts water vapor generated from the contents when the contents are heated together with the packaging bags to prevent the packaging bags from bursting.

  In recent years, cooked or partially cooked processed foods have been widely used and distributed for the purpose of preparing meals and simplifying the provision of dishes. In particular, demand is growing more than ever due to a demand for fewer people per household and a reduction in cooking expenses at restaurants. Such cooked food is provided by being enclosed in containers, packaging bags and the like made of various resin films for convenience of distribution. The cooking of cooked food is roughly divided into hot pots such as pans and a microwave oven (high frequency range), and final cooking is often performed. In particular, microwave heating is often preferred from the viewpoint of shortening the heating time and simplifying the work. Therefore, the heat resistance and pressure resistance of the resin film container for food packaging have been enhanced to cope with microwave heating. When heating using a microwave oven, a container expand | swells with the water vapor | steam which arises with evaporation from the contents, such as a foodstuff. However, there is a limit to the expansion of the container. In containers and packaging bags, when the internal pressure reaches a certain limit, the container (packaging bag) bursts and is very dangerous. At the same time, the inside of the microwave is soiled.

  Conventionally, in order to prevent rupture due to water vapor, a user has to open a hole in a container (packaging bag) before heating, which is troublesome. In addition, although there are containers (packaging bags) provided with holes in advance, the airtightness of the containers themselves is not good and is mainly limited to packaging of frozen foods and the like. Therefore, a packaging bag having an automatic ventilation part in a part of the container and the packaging bag has been proposed in order to improve the airtightness of the container itself and to ensure a water vapor escape path in advance. Although the automatic vent is always closed, it is first opened in response to the expansion pressure of water vapor generated from the contents during heating. The filled water vapor is discharged to the outside of the packaging bag and plays the role of a safety valve that lowers the pressure in the container.

  The present inventor has previously developed an automatic ventilation packaging bag capable of exhausting water vapor without providing upper and lower restrictions on how to place the packaging bag itself (see, for example, Patent Document 1). This automatic ventilation packaging bag is provided with an intermediate portion provided with an automatic ventilation portion between the upper surface portion and the lower surface portion of the bag-shaped main body, and the intermediate portion is formed by being folded into a W shape in a sectional view. Has an intermediate heat seal part, an aeration planned part projecting in an arc shape, a cylindrical part connected to the intermediate heat seal part and the aeration planned part shorter than the intermediate heat seal part, and an exhaust part for exhausting water vapor to the outside A top heat seal portion having an upper surface portion and an intermediate portion, and a lower heat seal portion having a lower surface portion and an intermediate portion, and upper portions on both the left and right sides in the lateral direction of the upper heat seal portion. An upper inclined heat seal part that is heat-sealed in an inclined shape from the heat seal end part to the side heat seal part is provided, and the lower heat seal end part on both the left and right sides of the lower heat seal part is applied to the side heat seal part. Lower inclined heat sealed portion which is heat-sealed to the inclined shape is provided.

  In the above automatic ventilation packaging bag, the entire bag is expanded along with the water vapor generated from the contents by heating of the microwave oven, and the water vapor is concentrated in the planned ventilation portion by using the expansion force of this water vapor. A destructive opening is created and water vapor is exhausted. At this time, the bag bottom has an expanded shape with irregular undulations due to the heat seal shape of the upper heat seal portion and the lower heat seal portion, so that the fracture opening of the planned ventilation portion is expanded and the shape is maintained. Therefore, the water vapor is stably exhausted, good exhaust efficiency is obtained, and expansion burst is avoided.

  Moreover, this automatic ventilation packaging bag is mounted in a microwave oven in a laid state and heated. In that case, since the ventilation plan part is provided in the intermediate part between the upper surface part of a bag bottom part, and a lower surface part, it can be used without providing an up-and-down restriction | limiting. Moreover, since the intermediate ventilation plan part moves upward from the ground contact surface during expansion, the liquid level of the contents does not easily reach the ventilation plan part even if the contents of the soup such as curry are the contents. Further, since the tubular portion is connected to the planned ventilation portion, the contents ejected into the cylindrical portion are retained even when the contents reach the planned ventilation portion.

  The automatic ventilated packaging bag can suppress the blowout of the contents during heating, and is particularly effective for the contents of soup. Similarly, blowing out during heating is effectively suppressed even in solid contents with low sap. However, when the content is less succulent, the generation of water vapor is less than that of the soup-like content, and there is no problem with the liquid level. Accordingly, there is a need for an automatic ventilated packaging bag that can perform good evacuation while having a simple structure that does not require a complicated structure, corresponding to solid contents with low sap.

Japanese Patent No. 5946415

  The present invention has been made in view of the above points, and provides an automatic ventilated packaging bag capable of performing good evacuation while having a simpler structure than conventional ones.

  That is, the invention of claim 1 is a packaging bag having an open mouth portion formed by heat sealing of the side portion and the bottom portion of the overlapped film body, and the opening portion side on the side portion. A side constant width seal portion where the heat seal width is constant from the bottom side to the bottom side, and a side gradually decreasing seal portion where the heat seal width decreases from the side constant width seal portion to the bottom side, The bottom portion is provided with a bottom gradually decreasing seal portion in which the heat seal width decreases from both ends to the center side of the bottom portion, and a heat seal width narrower than the heat seal width of the bottom gradually decreasing seal portion in the center of the bottom portion. And an air-scheduled portion that protrudes in an arc shape toward the center side of the packaging bag and is heat-sealed, and heats between the film bodies on the back side of the base-air-scheduled portion. According to the automatic venting packaging bag, wherein the exhaust passage part which is not Lumpur is provided.

  The invention according to claim 2 is a narrow constant width seal portion in which a heat seal width is narrower and constant than the side constant width seal portion at the side portion between the side gradually decreasing seal portion and the bottom gradually decreasing seal portion. The automatic ventilated packaging bag according to claim 1, wherein

  According to a third aspect of the present invention, there is provided a bottom fixed width seal portion having a constant heat seal width between the bottom gradually decreasing seal portion and the planned ventilation portion, and the heat seal width of the planned ventilation portion is the bottom constant width. The automatic ventilated packaging bag according to claim 1 or 2, wherein the bag is narrower than the seal portion.

  The invention according to claim 4 is any one of claims 1 to 3, wherein the maximum protruding position of the planned ventilation portion enters the center side of the packaging bag with respect to the maximum width of the bottom gradually decreasing seal portion. Related to automatic ventilation packaging bags.

  The invention according to claim 5 relates to the automatic ventilated packaging bag according to any one of claims 1 to 4, wherein a crimp sealing part for crimping the superposed film body to the exhaust passage part is provided.

  The invention according to claim 6 relates to the automatic ventilation packaging bag according to any one of claims 1 to 5, wherein a reinforcing seal portion is provided on the side portion side of the bottom gradually decreasing seal portion.

  According to the automatic ventilated packaging bag of the invention of claim 1, a packaging bag having an open mouth formed by heat sealing of the side part and the bottom part of the overlapped film body, the side part, A side constant width seal portion in which the heat seal width is constant from the opening side to the bottom side, and a side gradually decreasing seal portion in which the heat seal width decreases from the side constant width seal portion to the bottom portion. The bottom portion is provided with a bottom gradually decreasing seal portion in which the heat seal width decreases from both end sides to the center side of the bottom portion, and in the center of the bottom portion than the heat seal width of the bottom gradually decreasing seal portion. It has a narrow heat-sealing width, and is provided with a planned ventilation portion that protrudes in an arc shape toward the center side of the packaging bag and is heat-sealed. Since the exhaust passage part that is not heat-sealed between bodies is provided, the structure is simpler and easier to manufacture than in the past, manufacturing costs are reduced, and water vapor generated during heating expansion is efficiently removed. Water vapor can be exhausted appropriately and safely because it can be concentrated on the planned ventilation side. Moreover, such an automatic ventilation packaging bag is most suitable for solid contents with less squeeze.

  According to the automatic ventilated packaging bag of the invention of claim 2, in the invention of claim 1, the side-side portion between the side-side gradually decreasing seal portion and the bottom-side gradually decreasing seal portion is more than the side-side constant width seal portion. Since the narrow and constant width seal portion having a narrow and constant heat seal width is provided, the inclined position of the side gradually decreasing seal portion can be adjusted according to the length of the heat seal portion.

  According to the automatic ventilated packaging bag of the invention of claim 3, in the invention of claim 1 or 2, the bottom constant width seal portion having a constant heat seal width between the bottom gradually decreasing seal portion and the planned ventilation portion is provided. Since the heat sealing width of the planned ventilation portion is narrower than that of the bottom fixed width seal portion, the inclination of the bottom gradually decreasing seal portion can be adjusted according to the length of the heat seal portion.

  According to the automatic ventilated packaging bag of the invention of claim 4, in the invention of any one of claims 1 to 3, the maximum projecting position of the vented portion is more than the maximum width of the bottom-side gradually decreasing seal portion. Since it enters the center side, the planned ventilation portion is likely to be first subjected to the internal pressure during heating and expansion, and the fusion between the films can be efficiently broken.

  According to the automatic ventilated packaging bag of the invention of claim 5, in the invention of any one of claims 1 to 4, the crimp sealing part for crimping the overlapped film body to the exhaust passage part is provided. In addition, the exhaust passage part before heating expansion can be in a closed state, and at the time of destruction of the aeration planned part due to heating expansion, the pressure bonding can be easily released and opened.

  According to the automatic ventilated packaging bag of the invention of claim 6, in the invention of any one of claims 1 to 5, a reinforcing seal part is provided on the side part side of the bottom part gradually decreasing seal part. It is possible to reinforce the heat seal on the side of the side.

1 is an overall perspective view of an automatic ventilation packaging bag according to an embodiment of the present invention. It is an upper surface schematic diagram of an automatic ventilation packaging bag. It is a schematic diagram of the side part side of an automatic ventilation packaging bag. It is a schematic diagram of the bottom side part side of an automatic ventilation packaging bag. It is a schematic diagram of the ventilation plan part. It is an expansion conceptual diagram of an automatic ventilation packaging bag. It is an upper surface schematic diagram of the packaging bag of a comparative structure. It is the perspective view which represented typically the heat seal process to the side part of an automatic ventilation packaging bag. It is a schematic diagram by the side of the bottom part of the automatic ventilation packaging bag which concerns on other embodiment.

  The automatic ventilation packaging bag 10 of the present invention shown in FIGS. 1 and 2 includes a film body F, and is manufactured by heat sealing. This automatic ventilated packaging bag 10 is a packaging bag for retort foods, frozen foods, etc., and in particular, the whole packaging bag 10 can be cooked using a microwave oven (high frequency range, microwave oven). The packaging bag 10 is sterilized by retort after the contents are filled. The contents filled in the automatic aeration packaging bag 10 are mainly simmered rice, fried rice, pilaf, fried noodles, baked udon, pizza, Chinese bun, stir-fried vegetables, dumplings, shumai, yakitori, hamburger, dried fish, boiled fish, etc. There are few solid foods.

  As shown in FIG. 1, the automatic ventilated packaging bag 10 has an open mouth portion 15 formed by heat sealing the side portions 11 and the bottom portions 12 of the superimposed film bodies F1 and F2. This automatic ventilation packaging bag 10 is provided with a side constant width seal portion 20 and a side gradually decreasing seal portion 21 on the side portion 11, and a bottom gradually decreasing seal portion 30 and a ventilation planned portion 40 on the bottom portion 12. In addition, an exhaust passage portion 50 is provided in the planned ventilation portion 40. In the automatic ventilated packaging bag 10, after filling the contents, as shown in FIG. 2, the opening 15 is sealed to become an open heat seal part 16. And in the automatic ventilation packaging bag 10, when it expand | swells with the water vapor | steam which generate | occur | produces from the contents by heat cooking, the water vapor | steam in a bag is discharged | emitted from the ventilation plan part 40. FIG. In addition, in the automatic ventilation packaging bag 10, the side part 11 is comprised left-right symmetrically.

  As the film body F, a film which is a known retort packaging material is used. Film body F is a biaxially stretched film made of polypropylene film, polyamide film, polyester film, ethylene-vinyl alcohol copolymer, etc., aluminum oxide-deposited biaxially stretched polyester film, silica-deposited biaxially stretched polyester film, polymetaxylylene azide Examples thereof include heat-resistant films that can be applied to microwave ovens (high-frequency ranges), such as amide polyamide stretched films or coextruded laminated films of these with 6-nylon or the like. Normally, the listed films are formed by laminating (laminating) a film of a sealant film that is in contact with the contents and is fused to each other by heat sealing, and a polyamide resin film and a polyester resin film that protect the film. Or it is a laminated film of three or more layers. In the film body, the thickness of each film layer, the number of layers, the resin composition, the characteristics of the contents, the heat resistance temperature, the heat seal temperature, the strength as a packaging bag, the distribution route, the distribution form, etc. are comprehensively considered and selected. . For example, ZK93KM manufactured by Toray Film Processing Co., Ltd. is used for polypropylene films, and SP-R manufactured by Mitsubishi Plastics, Inc. is used for polymetaxylylene adipamide-based polyamide stretched films.

  As shown in FIG. 3, the side constant width seal portion 20 is a portion that is heat sealed to the side portion 11 so that the heat seal width W <b> 1 is constant from the opening portion 15 side to the bottom portion 12 side. The side constant width seal part 20 keeps the sealed state of the upper part of the bag together with the opening heat seal part 16 when the automatic ventilation packaging bag 10 is heated and expanded, thereby preventing the burst from occurring from the upper part of the bag. The heat seal width W1 of the side constant width seal portion 20 is 8 to 12 mm. When the heat seal width W1 is narrower than 8 mm, it may be difficult to appropriately form a side-side gradually decreasing seal portion 21 described later. When the width is larger than 12 mm, there is a problem that the heat seal width W1 is more than necessary and the internal capacity of the bag is reduced.

  As shown in FIG. 3, the side gradually decreasing seal portion 21 is a portion that is heat sealed to the side portion 11 so that the heat seal width W <b> 2 decreases from the side constant width seal portion 20 to the bottom portion 12. The side gradually decreasing seal portion 21 acts so as to concentrate the internal pressure at the time of heating expansion to the bottom portion 12 side (particularly the planned ventilation portion 40 side) due to the shape in which the heat seal width W2 decreases toward the bottom portion 12. The inclination angle of the side-side gradually decreasing seal portion 21 is 3 to 8 degrees, preferably about 5 degrees. When the inclination angle is smaller than 3 degrees, the change in the heat seal width is small, the expansion that gives priority to the bottom 12 is reduced, and it is difficult to concentrate the internal pressure efficiently on the planned ventilation 40 side. When the angle is larger than 8 degrees, the change in the heat seal width is excessive, and it is difficult to appropriately expand the bottom portion 12 side.

  The connection position between the side-side gradually decreasing seal portion 21 and the side-side constant width seal portion 20, that is, the reduction start position S1 of the heat seal width W2 is a substantially intermediate position in the length direction of the side portion 11. If the decrease start position S1 is too close to the opening 15 side, the heat seal width is not changed, the expansion giving priority to the bottom 12 is reduced, and the internal pressure is efficiently concentrated on the planned ventilation portion 40. It becomes difficult. Even when the decrease start position S1 is too close to the bottom portion 12 side, the change in the heat seal width is poor, and the internal pressure cannot be concentrated on the bottom portion 12 side.

  Further, the heat seal width W3 of the side edge portion 12 side end portion of the side gradually decreasing seal portion 21, that is, the side minimum heat seal width W3 is 4 to 6 mm. When this side minimum heat seal width W3 is narrower than 4 mm, the adhesive force is insufficient and there is a risk of bursting during heating expansion. When the width is larger than 12 mm, the inclination is too small with respect to the side constant width seal portion 20, and it is difficult to concentrate the internal pressure on the bottom portion 12 side. In addition, the heat seal width W2 of the side gradually decreasing seal portion 21 is gradually decreased between the heat seal width W1 of the side constant width seal portion 20 and the side minimum heat seal width W3.

  In the side portion 11 between the side gradually decreasing seal portion 21 and the bottom gradually decreasing seal portion 30, as shown in FIG. 3, the heat seal width W 4 is narrower and smaller than the side constant width seal portion 20. A width seal portion 22 is provided. The narrow constant-width seal portion 22 is a portion that adjusts the inclined position of the side gradually decreasing seal portion 21 in accordance with the length of the heat seal portion. For example, when the packaging bag 10 has a large capacity and the side portion 11 is long, the heat seal of the narrow constant width seal portion 22 is lengthened. When the packaging bag 10 has a small capacity and the side portion 11 is short, the narrow constant width is narrow. The heat seal of the seal part 22 is shortened. Thereby, the side side gradually decreasing seal part 21 is arrange | positioned in an appropriate position corresponding to the packaging bag of various internal capacity. Note that the heat seal width W4 of the narrow constant width seal portion 22 corresponds to the side minimum heat seal width W3 of the side gradually decreasing seal portion 21.

  As shown in FIGS. 2 to 4, the bottom gradually decreasing seal portion 30 is a portion that is heat-sealed so that the heat seal width W <b> 5 decreases from both ends of the bottom 12 to the center. The bottom gradually decreasing seal portion 30 acts so as to concentrate the internal pressure at the time of heating expansion to the later-described vented portion 40 side by the shape in which the heat seal width W5 decreases toward the center side of the bottom portion 12. The heat seal width on the center side of the bottom gradually decreasing seal portion 30, that is, the minimum bottom heat seal width W6 is 2 to 4 mm. When this bottom side minimum heat seal width W6 is narrower than 2 mm, there exists a possibility that it may rupture at the time of heating expansion due to insufficient adhesion. If it is wider than 4 mm, it may be difficult to concentrate the internal pressure on the planned ventilation portion 40 side. The heat seal width on the side 11 of the bottom gradually decreasing seal portion 30, that is, the bottom maximum heat seal width W7 is not particularly limited as long as it is wider than the bottom minimum heat seal width W6. In the bottom gradually decreasing seal portion 30, the heat seal width W5 is gradually decreased between the bottom maximum heat seal width W7 and the bottom minimum heat seal width W6.

  As shown in FIG. 4, a bottom constant width seal portion 31 having a constant heat seal width is provided on the bottom portion 12 between the bottom gradually decreasing seal portion 30 and the planned ventilation portion 40. The bottom constant width seal portion 31 is a portion that adjusts the inclination of the bottom gradually decreasing seal portion 30 according to the length of the heat seal portion. The heat seal width W8 of the bottom side constant width seal portion 31 corresponds to the bottom side minimum heat seal width W6 of the bottom side gradually decreasing seal portion 30. The connection position S2 between the bottom gradually decreasing seal portion 30 and the bottom constant width seal portion 31 is a range from a substantially middle position in the length direction from the side portion 11 side of the bottom portion 12 to the planned ventilation portion 40 to the planned ventilation portion 40. It is. A gentle arc shape is formed on the bottom 12 so that the shape can be grasped.

  As shown in FIGS. 2 to 5, the scheduled ventilation portion 40 has a heat seal width W9 that is narrower than the heat seal width (bottom side minimum heat seal width W6) of the bottom gradually decreasing seal portion 30 in the center of the bottom portion 12, and the packaging bag 10 It is the site | part which protruded in the arc shape toward the center part side, and was heat-sealed. As shown to Fig.5 (a), the ventilation plan part 40 is a flat trapezoid shape. In the aeration planned part 40, the adhesion between the films by heat sealing is first destroyed (collapsed) at the time of thermal expansion, and the water vapor in the bag is exhausted. The ventilation plan part 40 is a weak part intentionally formed, and has the smallest heat seal width in any part of the automatic ventilation packaging bag 10. Moreover, the ventilation plan part 40 is formed so that the maximum projecting position thereof enters the center side of the packaging bag 10 with respect to the maximum width of the bottom gradually decreasing seal part 30 (the bottom maximum heat seal width W7). Thereby, the ventilation plan part 40 becomes easy to receive the internal pressure at the time of heating expansion first. That is, the force which the heat-sealed edge parts try to separate is received first. Accordingly, the adhesion between the films of the planned ventilation portion 40 is efficiently destroyed.

  As shown in FIGS. 2 to 5, the exhaust passage portion 50 is a portion that is not heat-sealed between the film bodies on the back side of the planned ventilation portion 40 in the bottom portion 12. When the ventilation plan part 40 is destroyed, the exhaust passage part 50 passes the water vapor in the bag and exhausts it to the outside of the bag. Further, the exhaust passage part 50 is provided with a pressure-bonding sealing part 51 for pressure-bonding the superimposed film body F. As shown in FIG. 5 (b), the pressure sealing part 51 closes the exhaust passage part 50 before heating expansion by sealing the stacked film body F without performing heat sealing. This makes it difficult for foreign matter to enter the exhaust passage portion 50. Further, the pressure-bonded sealing portion 51 is easily released from pressure bonding when the planned ventilation portion 40 is destroyed due to heat expansion. Therefore, the exhaust passage 50 is opened in accordance with the destruction of the planned ventilation portion 40, and the exhaust is efficiently performed. The pressure-bonding sealing portion 51 of the embodiment is a plurality of embossed portions that are formed by concavely or penetrating the overlapped film body F with a needle or the like. In addition, a point-like heat seal may be used. Thereby, the crimping | sealing sealing part 51 is formed very simply.

  Next, using FIG. 6, 7, the deformation | transformation state at the time of the thermal expansion of the automatic ventilation | gas_flowing packaging bag 10 of this invention is demonstrated, contrasting with the packaging bag 200 of a comparative structure. The packaging bag 200 having a comparative structure shown in FIG. 7A is a packaging bag in which the heat seal width of the side portion 211 is substantially constant throughout, that is, the side gradually decreasing seal portion is not formed. In FIG. 7, reference numeral 212 denotes a bottom side, 216 denotes an opening heat seal part, 220 denotes a side seal part, 230 denotes a bottom side seal part, 240 denotes a ventilation plan part, and 250 denotes an exhaust passage part.

  First, in the automatic ventilated packaging bag 10 of the present invention, as shown in FIG. 6, water vapor Vp (thick dotted arrow) generated from the contents in the packaging bag 10 by heating fills the bag and inflates the bag. At this time, since the side edge gradually decreasing seal portion 21 is formed on the side edge portion 11 of the packaging bag 10, the pressing amount of the film body F differs depending on the size of the heat seal width. Therefore, the volume from the side gradually decreasing seal portion 21 to the bottom portion 12 becomes larger than the volume from the side gradually decreasing seal portion 21 to the opening heat seal portion 16 (opening port portion 15). For this reason, the expansion | swelling by the side of the base part 12 becomes remarkable. On the bottom side 12 side of the automatic ventilated packaging bag 10, the planned ventilation portion 40 is the part that enters the innermost side. For this reason, the pressure of water vapor is easily applied to the planned ventilation portion 40. Since the internal pressure at this point accompanying the generation of water vapor is lower than the heat seal strength of each part, the heat seal portion is not broken.

  Here, the ventilation plan part 40 is a part where the heat seal width is the narrowest in any part of the automatic ventilation packaging bag 10 and the heat seal strength is intentionally weakened. When the internal pressure concentrated around the planned ventilation section 40 is increased and exceeds the heat seal strength of the planned ventilation section 40, the heat seal (fusion) of the planned ventilation section 40 is broken, and the planned ventilation section 40 is opened and exhausted. Communicating with the passage 50. Once the planned ventilation section 40 is opened, the pressure in the bag is increased and expanded, so that the steam is smoothly exhausted from the planned ventilation section 40 via the exhaust passage section 50 and immediately. The internal pressure is reduced. The water vapor is continuously exhausted until the internal pressure is almost balanced with the external pressure. As the internal pressure in the packaging bag 10 is reduced in this way, the internal pressure does not exceed the heat seal strength of the portion other than the planned ventilation portion 40, and the heat seal of the portion other than the planned ventilation portion 40 is not destroyed.

  On the other hand, in the packaging bag 200 having a comparative structure, as shown in FIG. 7B, the steam Vp5 (thick dotted straight arrow) generated by heating fills the bag and inflates the bag. At this time, since the heat seal width of the side seal portion 220 of the packaging bag 200 is constant throughout, there is no difference in the pressing amount of the film body F. Therefore, the packaging bag 200 is expanded as a whole, and the expansion is not biased unlike the packaging bag 10 of the present invention. In the packaging bag 200 having the comparative structure, the planned ventilation portion 240 is a fragile portion like the planned ventilation portion 40 of the packaging bag 10, but the expansion on the bottom side 212 side is not different from other portions, and therefore the packaging bag of the present invention. No pressure is applied to the ventilation plan part 240 from 10, and it becomes difficult to be destroyed. Therefore, the packaging bag 200 may be excessively expanded, or the heat seal may be broken at other sites before the planned ventilation portion 240.

  As described above, in the automatic ventilated packaging bag 10 of the present invention, since the expansion on the bottom side 12 side becomes remarkable due to the change in the heat seal width of the side side 11, excessive expansion and rupture are avoided, and the inside Water vapor is safely exhausted. In addition, since the content of the said automatic ventilation packaging bag 10 is a solid food with little sap, it is only ejection of water vapor | steam.

  Next, referring to FIG. 8, heat sealing processing for the side portion 11 of the automatic ventilation packaging bag 10, that is, the side constant width seal portion 20, the side gradually decreasing seal portion 21, and the narrow constant width seal portion 22 are formed. The procedure to do is demonstrated. When forming each seal part 20, 21, and 22 in the side part 11, the heat seal apparatus 100 shown in FIG. 8 is used. As shown in FIGS. 8A and 8B, the heat sealing apparatus 100 includes a first hot plate 110 having a linear pressure bonding surface 111 and a second heat plate having a pressure bonding surface 121 in which an inclined portion 122 is formed. 120. In addition, in the heat seal apparatus 100, an attached apparatus is abbreviate | omitted for convenience of illustration.

  In this heat sealing apparatus 100, as shown in FIG. 8B, the second hot plate 120 is in close contact with the side portion of the first hot plate 110, and the second hot plate 120 is front and rear with respect to the first hot plate 110. To be placed at a desired position. That is, the inclined portion 122 of the second hot plate 120 corresponds to the side gradually decreasing seal portion 21, and the close contact portion side between the first hot plate 110 and the second hot plate 120 is the side constant width seal portion 20 and the second heat plate. The portions of the first heat plate 110 that are not in close contact with the plate 120 correspond to the narrow constant width seal portion 22. Then, the two film bodies F1 and F2 are placed on the placement portion 130 so as to be placed on each other, and as shown in FIG. The film body F is pressure-bonded, and the side constant width seal portion 20, the side gradually decreasing seal portion 21, and the narrow constant width seal portion 22 are formed on the film body F, respectively.

  Thus, by using the heat sealing apparatus 100, the heat sealing process of the side part 11 can be implemented efficiently. In particular, the heat seal apparatus 100 can freely adjust the position of the side gradually decreasing seal portion 21 by sliding the second heat plate 120 back and forth with respect to the first heat plate 110, so It can flexibly handle bag making of different packaging bags. Therefore, packaging bags with various internal capacities can be created separately only by changing the position of the second hot plate 120. In the example shown in the figure, heat sealing processing was performed on one side portion, but heat sealing devices were arranged symmetrically on both sides of the film body, and both side portions were heat sealed at once. Also good. In this way, heat sealing can be performed more efficiently.

  FIG. 9 is a schematic view of automatic ventilation packaging bags 10A and 10B according to another embodiment. The automatic ventilated packaging bag 10A shown in FIG. 9A allows the end of the side gradually decreasing seal portion 21 to reach the bottom portion 12 without forming a narrow constant width seal portion on the side portion 11, and has a constant bottom width. This is an example in which the end of the bottom gradually decreasing seal portion 30 is made to reach the ventilation target portion 40 without forming a seal portion. For example, when the packaging bag has an extremely small capacity, a narrow constant width seal portion may not be formed due to the relationship between the inclination angle of the side gradually decreasing seal portion 21 and the reduction start position. Thus, even if it does not have a narrow constant width seal part or a bottom constant width seal part, the bottom part 12 side can be remarkably expanded.

  Moreover, the automatic ventilation packaging bag 10 </ b> B shown in FIG. 9B is an example in which the reinforcing seal portion 35 is provided on the side portion 11 side of the bottom gradually decreasing seal portion 30. The reinforcing seal portion 35 is a portion that reinforces heat sealing at both end portions of the bottom side portion 12, which is a connecting portion between the side gradually decreasing seal portion 21 or the narrow constant width seal portion 22 and the bottom gradually decreasing seal portion 30. The shape of the reinforcing seal portion 35 is an arc shape 36 or a linear shape 37 connecting the side portion 11 and the bottom portion 12.

  As shown and described above, the automatic ventilated packaging bag of the present invention is a packaging bag that accommodates solid contents with low squeeze, and the side constant width seal portion and the side gradually decrease on the side portion. A seal portion is formed, and a bottom gradually decreasing seal portion, a ventilation plan portion, and an exhaust passage portion are formed on the bottom portion. Therefore, the structure is extremely simple as compared with the prior art, the manufacturing is easy, the manufacturing efficiency can be improved, and the manufacturing cost is reduced. Moreover, the water vapor | steam which generate | occur | produced at the time of a heating expansion can be efficiently concentrated on the aeration plan part side by the side side gradually decreasing seal part of a side part, and the bottom side gradually decreasing seal part. Therefore, it is possible to exhaust water vapor appropriately and safely from the planned ventilation section.

  The automatic ventilated packaging bag of the present invention is a packaging bag adapted to contain solid contents with less squeeze, and has a simpler structure than the conventional one, improving manufacturing efficiency and manufacturing cost, and suitable for heating and expansion. In addition, it is possible to safely exhaust water vapor. Therefore, it is promising as an alternative to a commercially available packaging bag for solid food.

DESCRIPTION OF SYMBOLS 10 Automatic ventilation packaging bag 11 Side part 12 Bottom part 15 Opening part 16 Opening heat seal part 20 Side side fixed width seal part 21 Side side gradually decreasing seal part 22 Narrow constant width sealing part 30 Bottom side gradually decreasing seal part 31 Bottom side constant width seal Part 35 Reinforcement seal part 36 Arc-like reinforcement seal part 37 Linear reinforcement seal part 40 Planned ventilation part 50 Exhaust passage part 51 Crimp seal part 100 Heat seal device 110 First heat plate 120 Second heat plate 130 Placement part F, F1, F2 Film body S1 Decrease start position S2 Connection position between bottom gradually decreasing seal part and bottom constant width seal part Vp Water vapor W1 Heat seal width of side constant width seal part W2 Heat seal width of side gradually decreasing seal part W3 Side minimum heat seal width W4 Heat seal width of narrow constant width seal portion W5 Heat seal width of bottom gradually decreasing seal portion W6 Bottom minimum heat seal Seal width W7 bottom maximum heat seal width W8 bottom constant width seal of the heat seal width W9 ventilation scheduled portion of the heat seal width

Claims (6)

A packaging bag having an open mouth formed by heat sealing the side and bottom sides of the superimposed film body,
On the side portion, a side constant width seal portion having a constant heat seal width from the opening side to the bottom portion side, and a heat seal width decreases from the side constant width seal portion to the bottom portion. Side side taper seal part,
The bottom portion is provided with a bottom gradually decreasing seal portion in which the heat seal width decreases from the both ends of the bottom portion to the center side,
A heat-seal width narrower than the heat-seal width of the bottom-gradually decreasing seal portion at the center of the bottom portion, and a vented portion that is heat-sealed projecting in an arc toward the center side of the packaging bag; and An automatic ventilation packaging bag, characterized in that an exhaust passage portion that is not heat-sealed between the film bodies is provided behind the planned ventilation portion at the bottom.   The narrow side fixed seal part in which the heat seal width is narrower and constant than the side side fixed width seal part is provided in the side part between the side side gradually reduced seal part and the bottom side gradually reduced seal part. Automatic ventilation packaging bag as described.   A bottom constant width seal portion having a constant heat seal width is provided between the bottom gradually decreasing seal portion and the planned ventilation portion, and the heat seal width of the planned ventilation portion is narrower than that of the bottom constant width seal portion. The automatic ventilation packaging bag according to claim 1 or 2.   The automatic ventilation packaging bag according to any one of claims 1 to 3, wherein a maximum projecting position of the planned ventilation portion enters a center side of the packaging bag with respect to a maximum width of the bottom gradually decreasing seal portion.   The automatic ventilation packaging bag according to any one of claims 1 to 4, further comprising a pressure-bonding sealing portion that press-bonds the superposed film body to the exhaust passage portion.   The automatic ventilation packaging bag according to any one of claims 1 to 5, wherein a reinforcing seal portion is provided on the side portion side of the bottom side gradually decreasing seal portion.

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